Cutting or cleaving of slabs



June 6, 1950 A! R. LUNDQUIST 2,510,705

CUTTING 0R CLEAVING 0F SLABS Filed March 11, 1948 2 SheetsSheet l INVENTOR.

(we @Ld wwt, 624

June 6, 1950 A. R. LUNDQUIST CUTTING 6R CLEAVING OF SLABS 2 SheetLs-Sheet 2 Filed March 11, 1948 INVENTOR Patented June 6, 1950 3 2,510,705

pair-En harem ease hieee zsiree ei Weatheri h ree t, .thesmiieer e 3 h w A W oi s lalps areproduced each h vmg a rid'gektehding'acrws the back of the slab. It is-further ith ob' egt 9f the invention to provide a machine to perfg r ance of said method; v

One embodiment of the invention will be described wi'th' reference to tff fa'cdompanying h drawings, in which ie a eds a Side e a eet sh or a-sgaae according tp'theinvention; 1 Fi'g ire ZJis a 'top' view of the m achi e shpyvn in ha t v2 to leave spaces 1 there-between.

emem i s in stionht e "certain stage of its production a i 7 r k high? mgjih proc and sated as desr'ibe sees" sretsaseteiy Flgllre 5 O f the broken Off Slabs seen from in their places. As will be seen from Figure 2 its backthe board ll lies at such a level relative to the When carrying out the method q s to ribs or bars 6, on which the lower edges of the the invention a Slab of the materlal m questwn slabs a rest, that the board will be pressed against (for instance marble or lime stone) is first cut or the central or middle part of the slabs 9. sawn so as to obtain a thickness slightly exceed- The machine also has a fra or Support the double thickness of the final slab to carrying an arm 28, into which there is threaded p This thick Slab is placed edgewlse a screw 26 (see especially Figure 2). At its upper and sawn through from two opposite ends as will end the Screw 25 is provided t a hand wheel be seen from Figure In this figure h Slab is 21. The lower end of the screw is mounted in designated by 36, and the grooves 31 and 38 sawn another arm 2 in such a way t t when t n f m W pp ends are p that at the screw is rotated, the arm will be raised or lowered centre of the slab 36 there is left a ridge 39 not i l ti t th support The arm 2 is bein a u h and having 'a suitable width trolled by guides attached to the arm 29. The in order to allow the two halves of the slab easily arm 28 is provided with two bearings IT, in which to be broken into two at this place. After the a shaft I5 is journalled. At one end this shaft [5 grooves 31 and 38 have been made in the slab 36, carries a saw blade l4 and at its other end a belt it is broken into two parts, so that two slabs are pulley 3. A protecting cover [6 is arranged over obtained, each having at its back a ridge with a the saw blade M. The longitudinal position of more or less rugged surface of fracture, said ridge the saw blade I4 is adjusted in such a manner being the remainder of the portion 39 not sawn that it lies in a vertical plane dividing the slabs through. Figure 5 shows such a final half slab 9 into two equal parts. seen from its back. The slab is designated by 36 Fixed to the support I is a bar 24 the upper end and the said ridge by 40. The ridge 40 makes the of which I carries a lever 22 which is swingably 3 mounted by means of a bearing 23. At one end of the lever 22 there is mounted a motor 2| provided with a belt pulley 29. The pulley 20 is placed substantially vertically above the pulley 18. A belt l9 runs across the two pulleys. The other end of lever 22 is loaded with a weight 25, the belt I9 in this way always being tense independently of the temporary level of the pulley 18.

The arrangement operates in the following way: After the slabs 9 have been clamped between the board H and the beam l3 in the manner described hereinbefore (which ought to take place when the carriage 4 is in its right hand end position) the saw blade M is lowered by operating the hand wheel 21 so that the lower end of said saw blade will be located slightly above the central line of the slabs 9. After the circular saw blade M has been brought into rotation by the motor 29, the carriage is moved to the left by operating the hand wheel 39, and the saw blade 14 will then saw a groove into the slabs 9. When all slabs 9 have passed under the saw blade I4 the carriage 4 is returned to its initial position, and all slabs are turned round, so that their other side is turned upwards. Then the carriage is again moved to the left and a groove will now be cut into the side of the slabs 9 now turned upwards. When this operation has been finished, the slabs 9 now having the appearance shown in Figure 4 are removed. Finally, the slabs 9 are broken into two halves at their central ridge 39, so that two slabs provided with a ridge 49 are obtained of each slab 9.

Though the invention has hereinbefore been described in connection with a certain embodiment of same, it is obvious that the invention includes a number of modifications within the scope of the claims.

What I claim is:

1. Process of producing very thin slabs comprising the steps of forming from appropriate building material a thin slab-shaped element having opposite flat surfaces and opposite narrow edge faces; sawing into said thin slab-shaped element edgewise from said opposite narrow edge faces so as to leave a narrow non-sawn central portion of said thin slab-shaped element; supporting during said sawing said thin slab-shaped element in transversal direction normal to the plane of the sawing and from said opposite flat surfaces of said thin slab-shaped element only along said narrow non-sawn central portion of said thin slab-shaped element; and breaking thereafter said narrow non-sawn central portion of said thin slab-shaped element so as to obtain two very thin slabs, each having a ridge extending across one of said fiat surfaces of said very thin slabs and being the remainder of said narrow non-sawn central portion of said thin slabshaped element.

. 2. Process of producing very thin slabs comprising the steps of forming from appropriate building material a thin slab-shaped element having opposite flat surfaces and opposite narrow edge faces; sawing into said thin slab-shaped element edgewise from said opposite narrow edge faces so as to leave a narrow non-sawn central portion of said thin slab-shaped element; pressing during said sawing in transversal direction normal to the plane of sawing against said opposite flat surfaces of said thin slab-shaped element only along said narrow non-sawn central portion thereof so as to support during sawing said thin slab-shaped element from said opposite fiat surfaces thereof only along said narrow non-sawn central portion of said thin slabshaped element; and breaking thereafter said narrow non-sawn central portion of said thin slab-shaped element so as to obtain two very thin slabs, each having a ridge extending across one of said fiat surfaces of said very thin slabs and being the remainder of said narrow non-sawn central portion of said thin slab-shaped element.

AXEL RICHARD LUNDQUIST.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

